As a city kid I never thought it was, till I moved to rural Michigan and some of the local kids explained it to me.
To me sounds like a dandy way to get shot by a farmer.
Did they also mention 'smart pills'*?
*Smart Pills: Small, round, blackish brown; best ones are still a little soft & slightly moist. You find them in the pasture, where they grow like mushrooms; eating 2 three times a day will guarantee you an A in algebra!